DC to AC synthesizer with inverter circuit failure avoidance

Details DC to AC synthesizer with inverter circuit failure avoidance DC to AC synthesizer with inverter circuit failure avoidance

1980-10-01

1982-04-27

Pellinen, A. D.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

361 18, H02H 7122

Patent

active

043274064

ABSTRACT:
The A.C. synthesizer is a unit developing several hundred watts at 60 Hz by ulse-width modulation techniques, with an 8 KHz sawtooth oscillator modulating a 60 Hz reference. Several failure modes common to electronic equipment caused the output stages designed for a pulse rate of 8 KHz to experience inputs from 60 Hz to as low as D.C., which inputs destroy expensive transistors. The addition of a retriggerable "one-shot" (monostable multivibrator) to inhibit the pulse width modulator output if not retriggered each 8 KHz cycle eliminates the catastrophic effect of most failure modes, allowing the output stage to reject low frequency pulses.

REFERENCES:
patent: 3816810 (1974-06-01), Friedman et al.
patent: 4127894 (1978-11-01), Bishop et al.
patent: 4293888 (1981-10-01), McCarty

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